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Creosote Deposits
What is Creosote

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What is Creosote

Creosote is a formed from the distillation of tarry, carbon compounds and pyrolysis of organic - plant based materials.  Soot and tar are other common names for creosote and some other "interesting" names include; "creo-soot", creosol, creolsol, black chimney dust.  There are many types and ways creosote is formed including as a by product of burning woood.

How is Creosote Formed

​When you burn a fire, creosote is formed as a by product of incomplete combustion.  The off gases from the smoke condenses as it travels away from the fire - heat source producing carbon, water, combustible deposits on the inside of your chimney.  The black residue that builds up is defined as creosote. 

How to Clean Creosote - Chimney Maintenance and Service

​It is important to have your wood burning unit inspected by a qualified Chimney Professional to look for any defects, determine system compliance and ensure the unit is ready for use.  When the creosote deposits inside the chimney are 3mm or greater, the chimney should be swept.

Creosote and Chimney Fires

​As creosote accumulates inside your chimney, it restricts the venting draft of the wood burning appliance and causes poor function.  Creosote is also a fire safety hazard, as it can ignite and cause a dangerous chimney fire.​

Types of Creosote Deposits

There are different types of creosote and stages that are formed.  The type of creosote formed is dictated by the type of wood, amount of oxygen supply, moisture, temperature and the venting process. ​

Different Stages of Creosote Deposits Found in a Wood-burning Chimney

Stage 1 Creosote

Stage one creosote is mostly composed of sooty carbon deposits - "creo-soot".  Stage 1 creosote can be easily removed during a chimney sweep service.  This type of creosote is a natural by product of wood burning when there is adequate combustion air, the flue system is warm and is venting properly and wood with a low moisture content is being burned.
​

Stage 2 Creosote

Stage two or second degree creosote is a little thicker than stage 1 and can have shiny, thin flakes.  This type of deposit is formed by several factors including inadequate oxygen supply to the fire.  This type of deposit can generally be removed with a chimney power sweep.  Power sweeping is a chimney sweeping tool that utilizes a rod system and cleaning head attached to a drill.  The drill powers the chimney sweep system to power clean the interior.

Stage 3 Creosote

Stage three creosote is also defined as glazed creosote, or glaze.  The black tarry substance is produced when when the combustion is incomplete.  The incomplete combustion is often attributed to the flue temperatures inside the chimney being cool, poor oxygen supply, poorly functioning and venting wood burning system, wet wood, the use of a gas log lighter.  
Chimney Sweep Services

Stage 3 - Glazed Creosote

​Gazed creosote is very difficult to remove as it solidifies and fuses right to the surface.  In most cases an aggressive chemical treatment repair to chemically convert the glaze into another stage is needed to be able to power sweep it out of the chimney.  
​​Glazed creosote is a very dangerous type of chimney deposit, as it is loaded with fuel energy.  When the stage 3 ignites, it fuels a chimney fire with intense heat.
Glazed Creosote Removal Service

Puffed or Honeycomb Creosote

Fluffy puffed creosote that looks like honey combs is associated with a chimney fire.  This type of creosote is produced during the intense heat 

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  • Sweeps
    • Creosote
    • Dryer Vent Cleaning
      • Dryer Safety
  • Inspections
    • WETT Inspection
      • WETT Levels of Inspection Document
    • Levels of Chimney Inspections
  • Repairs
    • Leak Repairs
    • Chimney Repair
    • Fireplace Repairs
      • Fireplace Smoking Problems
      • Damper Repairs
      • Fireplace Damper Energy Efficiency
  • Installs
    • Fireplace Installation Service
      • Gas Fireplace Installation Service
        • Napoleon BHD4 Gas Fireplace Installation
      • RSF Fireplace Installation Service
        • Opel 2 Fireplace Installation Service
        • Pearl Fireplace Installation Manual
    • Heat Shields
    • Installation Manuals
  • Fireplace Shop
    • Wood Stoves
    • Chimneys
  • Service Locations
    • Calgary Chimney Services
      • Chimney Cleaning - Calgary
      • Calgary Fireplace Shop
      • City of Calgary Fireplace Permits
    • Cowichan Valley Chimney Services
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      • WETT Inspection Nanaimo
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  • Contact
    • Service Request
  • Info
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      • Terms of Reference
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    • Fireplace Dampers
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    • Codes & Standards
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        • Masonry & Concrete Chimneys & Flues
          • Chimney Clearances
      • Masonry Fireplace Chimney Clearance Requirements
      • CSA B-365
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    • How To - DIY
      • Firewood DIY Guide
      • How To Burn Wood
      • How to Determine Appliance Certification
      • How To Not DIY
    • FAQ
      • Why is my Fireplace Blowing Smoking
      • What is Creosote
    • Fire Safety
      • Carbon Monoxide
      • Unregulated Chimney Industry
      • BBQ Fire Safety
    • Fireplace & Chimney Information Articles
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      • Website Terms of Use